The sound bullets that come out of the melon are very dense packets of sound, not entirely dissimilar from the packets that transmit computer information electronically, and so when these sounds bounce back to the killer whales, they carry a broad spectrum of information. This apparently means that when this information is processed by that highly evolved and complicated brain, it renders the orcas capable of not merely detecting the presence of objects (as our sonar does) but rendering a clear and detailed vision of what is there in the water. Indeed, it goes beyond mere vision; orcas can see
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